Weather trends are increasingly evident. This year, Luxembourg was once again warmer than average, with a mean temperature of 10.5 degrees Celsius. This places 2025 among the ten warmest years ever recorded in Luxembourg since 1947, guest meteorologist Luca Mathias of Meteolux said in an RTL interview, on Wednesday morning.
In addition to higher temperatures, the country also saw much more sun that usual. With around 250 extra hours of sunshine, 2025 also ranks among the top ten sunniest years on record. Rainfall levels were also above average.
According to Luca Mathias, these developments are direct consequences of climate change that have been clearly visible for the past 20 years.
Luca Mathias added that, aside from the last few days, a proper winter has yet to arrive. In December, Meteolux has so far recorded no snow at its Findel station and this has only happened three times before, in 1972, 2006 and 2015. Overall, December has been around two degrees warmer than average. An exceptionally warm December, the meteorologist stated.
Christmas, however, was a different story. Statistically, it was the coldest festive period in 15 years. But despite this, it was once again not cold enough for a white Christmas. However, snow could arrive around the New Year, Mathias said.
Other impressions Luca Mathias shared are that, unlike in other years, the weather in 2025 showed its drier side more in spring than in summer, a trend observed across much of Europe. In Luxembourg, March was not the driest month, but it was the sunniest since records began in 1947.
Rainfall varied significantly throughout the year. Rather than steady precipitation, there were pronounced fluctuations from month to month. September and October were particularly wet, making 2025 wetter than average overall. At Findel, rainfall exceeded the norm by around 150 litres per square metre.
The rainfall between 8 and 9 September broke all known intensity records, Mathias said. In just 12 hours, 123 litres per square metre fell at Findel, almost twice as much as is typically recorded in an entire month. At the time, Meteolux issued a red alert in response to the heavy rain.
Speaking of weather alerts, Luca Mathias said it is difficult to determine whether people always fully understand and properly assess weather warnings. However, even a yellow alert indicates that something may be developing and should be taken seriously. “We don’t issue a warning just because we feel like it”, he emphasised. He explained that there is an entire evaluation process based on many different criteria behind every alert and while in a small number of cases it might be slightly off, this is part of the nature of the system.
In Luxembourg, Meteolux avoids issuing warnings too early and instead tries to remain as close as possible to the weather event itself. This, Mathias explained, also increases confidence that the alert is accurate.
